Product Description:

The KDA 3.1-100-3-LPI-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Designed for high-precision machining centers, it converts the regulated DC bus energy of an Indramat supply module into controlled three-phase output that locks spindle speed to the numeric control command. By handling rapid acceleration, braking, and steady-state running within a single enclosure, the unit supports consistent surface finishes and tool life in automated production lines. This operating behavior helps maintain stable cutting conditions when spindle demand changes during tool entry, heavy cuts, or rapid speed corrections.

The drive connects to a shared DC bus energized at 300 VDC, and its power stage is dimensioned for a continuous armature current of 100 A. An integral heat sink blower draws power from a dedicated 220 V AC at 50–60 Hz source, and the unit operates in Forced Cooling mode to keep semiconductor temperatures within safe limits. Speed commands arrive through a SERCOS interface, allowing deterministic updates between the controller and drive. All components are specified to perform within an ambient range of 5 to 45 °C, so cabinet conditioning must maintain those limits during sustained cycle times.

For installations up to 1000 m above sea level, the thermal and dielectric margins remain unchanged, eliminating the need for derating at typical factory elevations. Process monitoring is aided by an auxiliary channel that delivers an incremental encoder output, providing real-time spindle position to external devices such as handoff controllers or quality sensors. The internal current controller samples phase feedback at high frequency to align motor flux with commanded values during dynamic speed changes. A dedicated second encoder input can be routed either to spindle feedback or to an additional motor axis, allowing dual-loop regulation without extra hardware.